| 摘要 |
PROBLEM TO BE SOLVED: To always maintain a good appearance of a spindle for moving a seat plate part upward and downward by a chair and the like, and prevent grease from being exposed to outside without causing such a phenomenon that a foreign matter is adhered to the spindle and withdrawn to the outside.SOLUTION: The gas cylinder includes: an outer cylinder having a guide hole 110; a spindle 200 comprising inner and outer pipes so that a gas moving path is formed on an inner wall; a piston rod 320 having the piston 200 in which an upper end of a rod 320 is slide-inserted in the inner pipe 220; a valve body 400 coupled to an upper side of the spindle 200, and controlling the spindle 200 to be driven upward and downward with the piston 200 as a center according to an action of a valve pin 420; a bushing member 500 formed to project in slide contact with the inner wall of the outer cylinder 100 outside a lower end of the spindle 200; and a bushing cap 600 coupled with an upper end of the outer cylinder 100 and having a guide hole 610 for guiding the spindle 200. |
